That Dave Macpherson in your coverup link appears to be a crackpot. The link below not only recaps his antics but demonstrates at least two other pretrib sources well before the time frame you are mentioning
Here is part of the problem with the post trib view. We know that the second coming Jesus returns with the elect. We also know that at the rapture Christians who are alive meet Jesus in the air.
It just doesn't make sense for us to meet Jesus in the air and then immediately return.